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Preparation method of diphenylamine micro-crystal suspension

A technology of diphenylamine and suspension, which is applied in the fields of dyes and agriculture, can solve problems such as the difficulty in preparing diphenylamine solution, and achieve the effects of wide application range, simple preparation method and long storage time

Inactive Publication Date: 2019-06-28
JIANGSU FEIYA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of the present invention is simple, has a wide application range, and can solve the problem of difficult preparation of diphenylamine solution in the existing dye industry and agriculture

Method used

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  • Preparation method of diphenylamine micro-crystal suspension
  • Preparation method of diphenylamine micro-crystal suspension
  • Preparation method of diphenylamine micro-crystal suspension

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preparation example Construction

[0027] A kind of preparation method of diphenylamine microcrystalline suspension of the present invention, this preparation method step is as follows:

[0028] a. Add diphenylamine to the high-speed shearing kettle and heat up to 60-80°C to melt the material;

[0029] b. Turn on the high-speed shearing machine and slowly increase the speed to 2000-7000r / min;

[0030] c. Maintain the temperature and rotation speed of the kettle, and slowly add 60-90wt% deionized water;

[0031] d. During the process of adding deionized water, slowly add 0.05-5wt% emulsifier, 0.05-1wt% spreading agent, and 0.01-1wt% defoamer;

[0032] e. Maintain the shear rate and slowly cool down to 10-20° C. to obtain a diphenylamine microcrystalline suspension with an average particle size of ≤35 μm.

[0033] Wherein, the emulsifier is disproportionated rosinate, dodecylbenzenesulfonate, dodecylsulfate, among which

[0034] Choose lauryl sulfate, the ratio of emulsifier to diphenylamine is 1:3~20.

Embodiment 1

[0036] Weigh 140g of diphenylamine, melt the diphenylamine into a liquid at 60-80°C, and slowly add 250g of deionized water, 8g of sodium dodecylbenzenesulfonate, 1g of Fatty acid sodium, 1g compound organic silicon defoamer and other processing aids form a stable milky white liquid, maintain a high shear rate, slowly cool down to 10-20 ° C, and prepare a suspension of diphenylamine microcrystals with a content of 35%.

Embodiment 2

[0038] Weigh 140g of diphenylamine, melt the diphenylamine into a liquid at 60-80°C, and slowly add 250g of deionized water, 8g of sodium lauryl sulfate, and 1g of sodium fatty acid under the action of a high-speed shearing machine at 2000-7000r / min , 1g compound organic silicon defoamer and other processing aids to form a stable milky white liquid, maintain a high shear rate, slowly cool down to 10-20 ° C, and prepare a suspension of diphenylamine microcrystals with a content of 35%.

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Abstract

The invention discloses a preparation method of a diphenylamine micro-crystal suspension. The preparation method comprises the following steps that diphenylamine is added into a high-speed shear kettle, and the temperature is increased to 60-80 DEG C for melting materials; a high-speed shear machine is turned on, the rotating speed is slowly increased to 2,000-7,000 r / min; the mild rotating speedof the kettle is maintained, and deionized water with the weight percentage being 60-90 is added slowly; when the deionized water is added, by weight, 0.05-5% of an emulsifier, 0.05-1% of a spreader and 0.01-1% of a defoaming agent are added slowly; the shear speed is maintained, and the temperature is decreased slowly to 10-20 DEG C to obtain the diphenylamine micro-crystal suspension. The prepared suspension is applicable to preparing diphenylamine dye, a fruit and vegetable storage processing solution can be diluted by water to any ratio, and use is convenient and rapid.

Description

technical field [0001] The invention belongs to the field of dyes and agriculture, and relates to a preparation method of diphenylamine microcrystalline suspension. Background technique [0002] Diphenylamine is an important raw material for dyes, which can be used to produce acid golden yellow G, acid orange IV, sulfur brilliant blue and so on. These disperse dyes are bright in color, have good color fastness and small temperature sensitivity, and have good application prospects. However, since the synthesis conditions of this type of dye are basically carried out in a low-temperature aqueous solution, and diphenylamine itself is solid at low temperature, and its solubility in water is very low, the solubility of diphenylamine in water is only 0.03g at 20°C. In the prior art, diphenylamine is dissolved in an acidic solution to increase its solubility, up to 1-2%. The use of diphenylamine in such an acidic solution to prepare dyes has low reaction efficiency and produces a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/154
Inventor 张健雄王忠冬熊畅
Owner JIANGSU FEIYA CHEM IND
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