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Preparation method of ultraviolet light absorber UV-326

A UV-326 and absorber technology, applied in the field of preparation of ultraviolet absorber UV-326, can solve the problems of increased manufacturing cost, waste of water and reaction raw materials, and aggravated pollution of industrial wastewater, and achieve low manufacturing cost and low solvent consumption low effect

Pending Publication Date: 2022-04-08
上海雄启化学科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the waste of water and reaction raw materials in the preparation process of the existing ultraviolet absorber UV-326 is relatively serious, resulting in increased pollution of industrial wastewater and increasing its manufacturing cost.

Method used

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  • Preparation method of ultraviolet light absorber UV-326
  • Preparation method of ultraviolet light absorber UV-326
  • Preparation method of ultraviolet light absorber UV-326

Examples

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Embodiment Construction

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of ill...

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Abstract

The invention discloses a preparation method of an ultraviolet light absorber UV-326. The preparation method comprises the following steps: reacting water, sulfuric acid, o-nitro-p-chloroaniline and sodium nitrite to obtain o-nitro-p-chloroaniline diazonium salt; the preparation method comprises the following steps: stirring water, petroleum ether, nekal and 2-methyl-4-tert-butylphenol, adding o-nitro-parachloroaniline diazonium salt, carrying out a coupling reaction, adding water, washing to be neutral, and spin-drying to obtain a 2-tert-butyl-4-methylphenol conjugate; water, caustic soda liquid, methanol, glucose, hydrazine hydrate, caustic soda flakes, aluminum powder, toluene and the 2-tert-butyl-4-methylphenol conjugate are subjected to an alkaline reduction reaction, and a toluene layer is reserved for standby application; performing an acidic reduction reaction on water, hydrochloric acid, zinc powder and the toluene layer, and reserving the toluene layer; a toluene layer is subjected to a decoloration reaction with activated carbon and carclazyte, filtering is performed, methanol is added for a crystallization reaction, spin-drying and drying are performed, and a finished product of the ultraviolet light absorber UV-326 is obtained. According to the preparation method, when the ultraviolet light absorber UV-326 is prepared, industrial wastewater, washing wastewater and a reaction solvent generated in the preparation process of the ultraviolet light absorber UV-326 are all distilled and reused.

Description

technical field [0001] The invention relates to the technical field of ultraviolet absorbers, in particular to a preparation method of ultraviolet absorber UV-326. Background technique [0002] Ultraviolet absorber is a light stabilizer, which can absorb the ultraviolet part of sunlight and fluorescent light source, and has super ultraviolet absorption capacity. [0003] Among them, the UV absorber UV-326 is a representative one among the benzotriazole UV absorbers. It is in the form of light yellow crystalline powder and has the characteristics of stable performance, low toxicity and strong ultraviolet absorption ability. It is widely used It is used in photosensitive materials, polymers, outer protective coatings and other fields. However, the waste of water and reaction raw materials in the preparation process of the existing ultraviolet absorber UV-326 is relatively serious, which leads to aggravated pollution of industrial wastewater and increases its manufacturing cos...

Claims

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Application Information

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IPC IPC(8): C07D249/20
Inventor 田良雄田上
Owner 上海雄启化学科技有限公司
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