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A kind of preparation method of ultraviolet absorber uv-234

A UV-234, absorbent technology, applied in the field of UV absorbent preparation, can solve the problems of increased workload, inaccuracy, manual control in batches, etc., to reduce pollution, reduce demand, and avoid excessive reaction speed. quick effect

Active Publication Date: 2019-05-21
福建帝盛科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the batch method relies on manual control, which is inaccurate and will increase the workload

Method used

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  • A kind of preparation method of ultraviolet absorber uv-234
  • A kind of preparation method of ultraviolet absorber uv-234

Examples

Experimental program
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Effect test

Embodiment 1

[0038] ①According to the weight ratio, aluminum powder:adsorbent=0.5:1, add metal powder and coke to the double-helix mixer and mix evenly;

[0039] ② Press molding;

[0040] ③Under nitrogen protection, control the temperature to 1200°C for sintering;

[0041] ④ Cooling with water and molding to obtain a reducing agent the size of soybean grains, with a diameter of 2 mm.

Embodiment 2

[0043] ① According to the weight ratio, iron powder: adsorbent = 2: 1, add metal powder and clay to the double-helix mixer and mix evenly;

[0044] ② Press molding;

[0045] ③Under nitrogen protection, control the temperature to 700°C for sintering;

[0046] ④ Cooling with water and molding to obtain a reducing agent the size of soybean grains with a diameter of 6mm.

Embodiment 3

[0048] ① According to the weight ratio, zinc powder: adsorbent = 1.5: 1, add metal powder and coke to the double-helix mixer and mix evenly;

[0049] ② Press molding;

[0050] ③Under nitrogen protection, control the temperature to 900°C for sintering;

[0051] ④ Cooling with water and molding to obtain a reducing agent the size of soybean grains, with a diameter of 10 mm.

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Abstract

The invention discloses a preparation method of an ultraviolet light absorber UV-234. The preparation method comprises the following steps: reducing an azo-intermediate represented by formula (I) into nitric oxide represented by formula (II) by virtue of a reductant, reducing the nitric oxide into a product represented by formula (III) by virtue of the reductant, wherein the reductant is prepared by sintering metal powder and an adsorbent, and the formulae (I), (II) and (III) are shown in the specification. The preparation method of the ultraviolet light absorber UV-234 has the beneficial effects that the consumption of the metal powder is low, the environmental pollution is low, the operation is convenient and simple, and the product yield is high.

Description

technical field [0001] The present invention relates to a kind of preparation method of ultraviolet absorber, more specifically, it relates to a kind of preparation method of ultraviolet absorber UV-234. Background technique [0002] The existing synthesis methods of benzotriazole ultraviolet absorbers mainly use azobenzene compounds as raw materials and carry out reduction according to different reduction processes. According to different reducing agents used, the reduction of benzotriazole compounds can be divided into one-step method and two-step method. The so-called one-step method is to use a reducing agent to reduce the azo dye to the product, and the so-called two-step method is to use a reducing agent to reduce the dye to nitrogen oxides. According to the situation, the nitrogen oxides can be separated or not separated, and then The nitrogen oxide intermediate is reduced to the final product with another reducing agent. [0003] A large number of experiments have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D249/20C07D487/04
CPCC07D249/20C07D487/04
Inventor 潘行平袁忻熊伟
Owner 福建帝盛科技股份有限公司
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