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Temperature-resistant iron oxide yellow pigment with flame retardant function and preparation method thereof

A technology of iron oxide yellow and temperature resistance, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of loss of bound water, limitation of polymer material coloring application, poor heat resistance of iron oxide yellow, etc.

Active Publication Date: 2014-03-12
HUZHOU TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat resistance of iron oxide yellow is relatively poor. When heated above 177°C, bound water will be lost, and dehydration will be accelerated at 270~300°C and transformed into iron oxide red.
Due to the poor thermal stability of iron oxide yellow, it is greatly restricted in the application of polymer material coloring

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh 100 g of iron oxide yellow and uniformly disperse in 1 L of water under stirring to form a mixed solution with iron yellow content of 10%. Dissolve 0.16mol magnesium sulfate and 0.04mol aluminum sulfate in 200mL water to configure solution A, and dissolve 0.4mol sodium hydroxide and 0.02mol sodium carbonate in 200mL water to configure solution B. Then, solution A and solution B were slowly added dropwise into the iron yellow mixed solution at the same time, and the pH value of the solution was controlled at 9, and the stirring was continued for 2 hours after the solution was dropped. Then crystallize at 60°C for 6 hours, filter and wash with suction, dry the filter cake at 70°C, and pulverize it to obtain product A of heat-resistant iron oxide yellow.

Embodiment 2

[0015] Weigh 100g of iron oxide yellow and disperse evenly in 500mL of water under stirring to form a mixed solution with iron yellow content of 20%. Dissolve 0.8mol magnesium nitrate and 0.4mol aluminum nitrate in 200mL water to configure solution A, and dissolve 2.4mol sodium hydroxide and 0.2mol sodium carbonate in 200mL water to configure solution B. Then, solution A and solution B were slowly added dropwise into the iron yellow mixed solution at the same time, the pH value was controlled at 10, and stirring was continued for 1 h after the solution was dropped. Then crystallize at 80°C for 2 hours, filter and wash with suction, dry the filter cake at 90°C, and pulverize it to obtain product B of heat-resistant iron oxide yellow.

Embodiment 3

[0017] Weigh 100 g of iron oxide yellow and evenly disperse in 2 L of water under stirring to form a mixed solution with a content of iron yellow of 5%. Dissolve 7.2mol of magnesium chloride and 2.4mol of aluminum chloride in 200mL of water to form solution A, and dissolve 19.2mol of sodium hydroxide and 1.2mol of sodium carbonate in 200mL of water to form solution B. Then, solution A and solution B were slowly added dropwise into the iron yellow mixed solution at the same time, the pH value was controlled at 9.5, and the stirring was continued for 0.5 h after the solution was dropped. Then crystallize at 70°C for 10 hours, filter and wash with suction, dry the filter cake at 80°C, and pulverize it to obtain temperature-resistant iron oxide yellow product C.

[0018] Temperature resistance test: Weigh 2g of the product, put it into a small crucible, heat it in an oven at 240°C for 0.5h, take it out and cool it, and then measure the color difference ΔE of the product on a spect...

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Abstract

The invention provides a temperature-resistant iron oxide yellow pigment with a flame retardant function and a preparation method thereof. Iron oxide yellow is an important inorganic yellow pigment but the iron oxide yellow is poor in temperature resistance and is heated and decomposed at about 177 DEG C to turn red. According to the pigment provided by the invention, the iron oxide yellow is taken as a raw material, and the outer layer of the iron oxide yellow is wrapped with hydrotalcite, so that the heat resistance of the iron oxide yellow is improved to over 240 DEG C so as to use the iron oxide yellow as a colorant in a high molecular material processing process. Meanwhile, as hydrotalcite losses moisture at high temperatures and releases carbon dioxide, so that the pigment has a good flame retardant effect. The composite iron oxide yellow pigment synthesized by the invention has the advantages of good temperature resistance and flame retardant performance, simple synthetic method, low cost, safety, environment-friendliness and the like, and has a wide market application prospect.

Description

technical field [0001] The invention relates to a heat-resistant iron oxide yellow pigment with a flame-retardant function and a preparation method thereof, especially a composite material formed by coating iron oxide yellow with hydrotalcite, which improves the heat resistance of iron oxide yellow and can be used as a polymer material for coloring agent and flame retardant. Background technique [0002] Globally, iron oxide is the second largest inorganic pigment after titanium dioxide and the largest colored inorganic pigment. Generally speaking, iron oxide-based colors include four types of iron oxide red, yellow, black and brown based on iron oxide. Of all the iron yellow pigments consumed in the world, more than 70% are mixed with synthetic products and natural mineral processed products, such as iron oxide and organic compounds, and nucleated iron oxide pigments. [0003] Iron oxide yellow is also called iron oxyhydroxide, referred to as iron yellow, and its chemical...

Claims

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Application Information

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IPC IPC(8): C09C1/24C09C3/06C08K3/22C08K9/02C08L101/00
Inventor 潘国祥李金花沈辉柴大淦王高民盛欧微张玉建曹枫
Owner HUZHOU TEACHERS COLLEGE
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