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Prepn of medicinal iron oxide pigment

An iron oxide pigment and iron oxide technology, applied in fibrous fillers and other directions, can solve the problems of inability to prepare medical red iron oxide pigments, complicated post-treatment processes in the background technology, etc. Post-processing simple effects

Inactive Publication Date: 2002-10-16
SHANGHAI YIPIN PIGMENTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the present invention solves the problem that the prior art cannot prepare red iron oxide pigments for medicine, overcomes the disadvantages of complex post-treatment processes in the background technology, and produces medical iron oxide pigments with bright colors and fine and soft particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] nucleation

[0032] A weight of 340 grams of nitric acid (100% concentration) and a weight of 430 grams of iron flakes and a weight of 5000 grams of water react at 130 ° C under 3.5 atmospheres and keep the reaction time for 2 hours to generate red Fe 2 o 3 Nucleus suspension.

[0033] Formation of ferrous sulfate and ferrous nitrate

[0034] 180 grams of sulfuric acid, 100 grams of iron flakes and 900 grams of water were added to the reactor under normal pressure, and the steam was reacted for 4 hours to generate a ferrous sulfate solution. In the reaction solution, sodium sulfide solution was added so that the amount of sodium sulfide added was 0.5 g / liter, remove impurity heavy metal sulfide precipitation, the content that gets purification is the ferrous sulfate solution of 400 grams / liter.

[0035] Put 600 grams of nitric acid, 100 grams of iron flakes and 2000 ml of water into the reactor, react at 59 °C for 4 hours under normal pressure to generate ferrous ni...

example 2、 example 3、 example 4、 example 5

[0041] Except for the change of feeding ratio of ferrous sulfate solution, ferrous nitrate solution, crystal nucleus suspension and sodium hydroxide solution in the pigment generation stage, the pH was controlled at 2-4, and other operating steps were the same as in Example 1; the results are shown in Table 1.

[0042]

example 6-9

[0044] Example 6-9 The batching ratio and operation steps are the same as in Example 1, except that the pH value is changed, and the quality indicators of the red iron oxide pigment for medicine prepared by the reaction are shown in Table 2.

[0045]

[0046]The coloring strength of the medical red iron oxide pigment prepared by each of the above examples is 105% in Example 1-2, 98% in Example 3, 110% in Example 4, 112% in Example 5, and about 50% in Example 8-9. The corresponding product material diameters are 0.25μm, 0.40m, 0.18m, 0.16m, 0.40m, and the product colors are red in Example 1, red in Example 2-3, red in Example 4-5, and red in Example 8-9 brown.

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PUM

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Abstract

The present invention relates to the preparation of medicinal iron oxide pigment. The technological process includes the steps of: crystal nucleus preparation, pigment preparation and reaction product separation. The crystal nucleus preparation is reaction of iron flakes and nitric acid to produce iron oxide crystal nucleus suspension. The pigment preparation includes reaction of iron flakes, sulfuric acid and water to produce ferrous sulfate solution and adding water soluble sulfide to eliminate As, Pb and Hg impurity deposit; reaction of iron flakes, nitric acid and water to produce ferrousnitrate solution and adding water soluble sulfide to eliminate As, Pb and Hg impurity deposit; mixing the purified ferrous sulfate solution, ferrous nitrate solution and iron oxide crystal nucleus suspension, adding air and water solution of NaOH to control pH to 2-4 to produce iron oxide pigment suspension.

Description

technical field [0001] The invention relates to a process for preparing iron oxide pigments, more precisely, the invention relates to a preparation method for preparing iron oxide pigments for medicine. Background technique [0002] Iron oxide pigment is a very important inorganic pigment, which is widely used in paints, coatings, construction, plastics, rubber, medicine, cosmetics, pet feed and other industries. Iron oxide pigments for medicine are mainly used in pharmaceutical tablet coating, capsule coloring, pet feed coloring and cosmetic coloring, etc. Iron oxide pigments for medicine are required to be non-toxic and contain no or little harmful impurities because they come into contact with human or animal bodies, such as the content of arsenic, lead, and mercury must meet the requirements of the Pharmacopoeia. Therefore, specific manufacturing techniques and processes must be selected for its preparation process. As far as the process of preparing iron oxide pigment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/24
Inventor 王丹英沈琴华
Owner SHANGHAI YIPIN PIGMENTS CO LTD
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