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Method for refining benzotriazole ultraviolet absorbent

A benzotriazole and refining method technology, applied in the direction of organic chemistry, can solve the problems of low quality, low light transmittance, low yield, etc., and achieve complete separation, good product quality, and high yield Effect

Active Publication Date: 2014-02-26
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

The disadvantages of this process are low product yield, low quality (low light transmittance, high metal ion content), high cost; more solid waste, large amount of solvent usage, which is not conducive to environmental protection

Method used

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  • Method for refining benzotriazole ultraviolet absorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: the refining method of a kind of benzotriazole ultraviolet absorber of this example, its step is: the benzotriazole ultraviolet absorber UV-P crude product of 500 kilograms is added in the still kettle and carry out heating distillation, Distill at 150-450°C and a vacuum of 500 Pa to completely vaporize the material, then pass the material into the condenser to condense, and the condensed material enters the liquid receiving tank, and then puts it into the liquid receiving tank The material was put into slicer and sliced ​​to obtain 485 kg of benzotriazole ultraviolet absorber finished product, with a purity of 99.5%, a light transmittance of 98.3%, and a metal ion content (Fe ion)≤5PPM.

Embodiment 2

[0017] Embodiment 2: the refining method of a kind of benzotriazole ultraviolet absorber of this example, its step is: the benzotriazole ultraviolet absorber UV-328 crude product of 500 kilograms is joined in the still kettle and carried out heating up distillation, Distill at 150-450°C and a vacuum of 500 Pa to completely vaporize the material, then pass the material into the condenser to condense, and the condensed material enters the liquid receiving tank, and then puts the liquid in the liquid receiving tank Put the material into a slicer to slice, and dry to obtain 483 kg of finished benzotriazole ultraviolet absorber UV-328, with a purity of 99.3%, a light transmittance of 99%, and a metal ion content (Fe ion) ≤ 5PPM.

Embodiment 3

[0018] Embodiment 3: the refining method of a kind of benzotriazole ultraviolet absorber of this example, its step is: 600 kilograms of benzotriazole ultraviolet absorber UV-P crude products are added in the still kettle and carry out heating distillation , distilled at 150-450°C and a vacuum of 300 Pa to completely vaporize the material, then pass the material into the condenser to condense, and the condensed material enters the liquid receiving tank, and then puts it into the liquid receiving tank Put the material into a slicer and slice it to get 582 kg of benzotriazole ultraviolet absorber UV-P finished product, with a purity of 99.5%, a light transmittance of 99%, and a metal ion content (Fe ion) ≤ 5PPM.

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Abstract

The invention relates to a method for preparing an ultraviolet absorbent, in particular to a method for refining a benzotriazole ultraviolet absorbent, and mainly solves the technical problems that product refining yield is low, quality is low, cost is high, a large number of solid wastes are generated, the using amount of a solvent is large, environment friendliness is not facilitated, secondary refining and even tertiary refining are needed to be performed if primary refining is not performed sufficiently, and the like in the prior art. The method comprises the following steps of: adding a crude benzotriazole ultraviolet absorbent product into a distillation kettle, heating for distillation, vacuumizing by using a vacuum unit to gasify the material, cooling the material by using a condenser, putting into a liquid receiving tank, and slicing the material by using a slicing machine to obtain the refined finished benzotriazole ultraviolet absorbent product.

Description

technical field [0001] The invention relates to a method for preparing an ultraviolet absorber, in particular to a method for refining a benzotriazole ultraviolet absorber. Background technique [0002] UV absorber is a kind of light stabilizer, which can strongly absorb ultraviolet rays (especially with a wavelength of 270-340nm); thermal stability is good, it will not change due to heat even during processing, and thermal volatility is small; chemical stability Good, no adverse reaction with the material components in the product; good miscibility, can be evenly dispersed in the material, no frosting, no leakage; the photochemical stability of the absorbent itself is good, no decomposition, no discoloration; colorless , non-toxic, odorless; resistant to immersion and other characteristics. [0003] The general structural formula of benzotriazole ultraviolet absorber is as follows: [0004] [0005] This type of ultraviolet absorber has a more efficient absorption ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D249/20
Inventor 周志强沈少华熊伟潘行平
Owner 福建帝盛科技股份有限公司