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Preparation method of benzotriazole ultraviolet light absorber

A technology of benzotriazoles and ultraviolet rays, applied in the field of ultraviolet absorption, can solve environmental pollution and other problems, achieve the effect of reducing side reactions, reducing possibilities, and improving purity and content

Inactive Publication Date: 2016-11-09
启东金美化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to provide a preparation method of benzotriazole ultraviolet absorber, which solves the problem of environmental pollution caused by waste water and waste, and has the effect that the waste water produced is more environmentally friendly

Method used

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  • Preparation method of benzotriazole ultraviolet light absorber
  • Preparation method of benzotriazole ultraviolet light absorber
  • Preparation method of benzotriazole ultraviolet light absorber

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Embodiment 1-4

[0041] Embodiment 1-4: a kind of preparation method of benzotriazole ultraviolet absorber, comprises the following steps:

[0042] Step 1: Add the azo dye intermediate shown in formula I, alkali, and the first solvent into the reactor; control the temperature at 60-80°C, slowly add hydrazine hydrate drop by drop for at least 30 minutes, and stir 1~4 hours; Sampling HPLC detects, as the residual amount of the azo dye intermediate shown in formula I is lower than 0.5wt% of its initial charging amount, the reduction reaction of hydrazine hydrate is completed;

[0043] Step 2: add sulfuric acid (or hydrochloric acid) to the mixed solution obtained in step 1 to neutralize the system until the pH of the system is 6 to 7, let stand to separate and take the oil phase, wash the oil phase with water to obtain the intermediate nitrogen shown in formula II solution of oxides;

[0044] Step 3: Move the solution of the intermediate nitrogen oxide shown in the formula II obtained in step 2 to...

Embodiment 5-8

[0051] Embodiment 5-8: a kind of preparation method of benzotriazole ultraviolet absorber, comprises the following steps:

[0052] Step 1: Add the azo dye intermediate shown in formula I, alkali, and the first solvent into the reactor; control the temperature at 60-80°C, slowly add hydrazine hydrate drop by drop for at least 30 minutes, and stir 1~4 hours; Sampling HPLC detects, as the residual amount of the azo dye intermediate shown in formula I is lower than 0.5wt% of its initial charging amount, the reduction reaction of hydrazine hydrate is completed;

[0053] Step 2: add sulfuric acid (or hydrochloric acid) to the mixed solution obtained in step 1 to neutralize the system until the pH of the system is 6 to 7, let stand to separate and take the oil phase, wash the oil phase with water to obtain the intermediate nitrogen shown in formula II solution of oxides;

[0054] Step 3: move the solution of the intermediate nitrogen oxide shown in the formula II obtained in step 2 ...

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Abstract

The invention discloses a preparation method of a benzotriazole ultraviolet light absorber. The method comprises the following steps: adding an azo dye intermediate represented by formula I to hydrazine hydrate, carrying out reduction to form an intermediate oxynitride represented by formula II, and reducing the intermediate oxynitride represented by formula II with hydrogen to prepare the benzotriazole ultraviolet light absorber represented by formula III, wherein the formula I, the formula II and the formula III are respectively shown in the description. The preparation method allows wastewater generated in the invention to be environmentally-friendly.

Description

technical field [0001] The invention relates to the field of ultraviolet absorption, in particular to a preparation method of a benzotriazole ultraviolet absorber. Background technique [0002] Plastics and other polymer materials, exposed to sunlight or high-energy rays, will undergo photooxidative degradation due to the absorption of ultraviolet light energy, resulting in polymer degradation and degradation, and performance degradation. UV absorber is a kind of light stabilizer, which can absorb the ultraviolet part of sunlight and fluorescent light source without changing itself. Adding ultraviolet absorbers to plastics and other polymer materials can selectively absorb high-energy ultraviolet rays, turning them into harmless energy for release or consumption. Benzotriazoles are one of the common UV absorbers, and their stabilization mechanism is shown in the following reaction equation A: [0003] [0004] Benzotriazole UV absorbers, also known as benzotriazole UV a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D249/20
CPCC07D249/20
Inventor 胡溶溶潘行平周志强
Owner 启东金美化学有限公司
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