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Preparation process of medium temperature resistant iron oxide yellow

A technology of iron oxide yellow and production process, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of small color change when heated, resistance to medium temperature iron oxide yellow, red color, poor heat resistance, etc. , to achieve the effect of low cost

Inactive Publication Date: 2010-09-08
南通宝聚颜料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main task of the present invention is to provide a kind of iron oxide yellow that can overcome the disadvantages of poor heat resistance and reddening of the color of ordinary iron yellow at present, and provide iron oxide yellow with a temperature resistance of 280 ° C. The color is consistent with ordinary iron yellow, and the color changes when heated. Manufacturing process of small medium temperature resistant iron oxide yellow

Method used

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  • Preparation process of medium temperature resistant iron oxide yellow
  • Preparation process of medium temperature resistant iron oxide yellow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Commercially available ordinary iron oxide yellow filter cake is 80 kg, its brand name is 301, and its water content is 72%. Put the raw materials and water into the beater according to the ratio, and control the slurry concentration at about 25%. Adjust the parameters of the beater: 1200 rpm At the same time, add the auxiliary agent aluminum silicate, start beating, keep warm according to the experimental steps and put in the neutralizer, separate and beat the powder to obtain product #301, and do the temperature resistance test of the raw materials and products (Pigment dry powder heat resistance test method GB1716-79) to get The data are as follows (based on unprocessed raw materials):

[0012]

[0013]

[0014] Ordinary iron yellow begins to change color at 150°C, but the color change of iron yellow at 280°C is DE≤0.5, so its heat resistance is at 280°C

Embodiment 2

[0016] Commercially available common iron oxide yellow is 80 kg, its brand name is 301, and its water content is 72%. Put the raw materials and water into the beater according to the ratio, and control the slurry concentration at about 25%. Adjust the parameters of the beater: 1200 rpm, At the same time, add the auxiliary agent aluminum silicate, start beating, add neutralizer for heat preservation, separate and beat the powder to obtain product #301, the effect of the amount of auxiliary agent on pigment 311 is as follows:

[0017] Auxiliary dosage (%)

[0018] When the amount of additives exceeds 0.5, the conductivity and water-soluble salts both exceed the standard, so the amount of additives should be below 0.5.

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Abstract

The invention discloses a preparation process of medium temperature resistant iron oxide yellow; iron oxide yellow is obtained through a wet sulfate oxidation method; before being dried, a filter cake is put into a beating machine when the slurry concentration is controlled to be 10 to 35 percent; additive is added into during the beating process, the heat is insulated to be 70 to 80DEG C after beating for 30min; and then neutralizer is added in to regulate the pH value and the heat is insulated for 30min; and after beating, iron yellow is produced through normal steps, and the medium temperature resistant iron oxide yellow is obtained after solid-liquid separation. The iron oxide yellow which is in needle-like particle crystal shape obtained through the wet sulfate oxidation method can stand 260 to 280DEG C after being treated, does not discolor or has small color changes; and simultaneously, the direction treatment of the filter cake of the iron oxide yellow is adopted, no other procedure is added, and the cost is lower than that of other temperature resistant iron yellow.

Description

Technical field: [0001] The invention relates to iron oxide yellow used in standard grades. The iron oxide yellow with a temperature resistance of 280°C is obtained through the post-treatment process of adding an auxiliary agent, aluminum silicate, to ordinary iron yellow, which is suitable for use in plastics, rubber, ceramics, building materials, etc. cryogenic field. Background technique: [0002] Iron oxide yellow is also called hydroxyl iron, referred to as iron yellow, and its chemical formula is Fe 2 o 3 ·H 2 O or n-FeOOH. Its color varies from lemon to yellow-orange depending on the grain size, and the grain size is between 0.5 and 2 μm. It has very good light fastness, atmospheric resistance and alkali resistance. Hiding power reaches 10~12g / m 2 . It has higher hiding power than all other yellow pigments and strong tinting power. However, the heat resistance is relatively poor. It loses hydration when heated above 177°C, and dehydration is accelerated at 270...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/24C09C3/06
Inventor 杨建明邵玉详
Owner 南通宝聚颜料有限公司
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