Benzotriazole-hindered amine composite photostabilizer and preparation method thereof

A technology of benzotriazole and light stabilizer, which is applied in the field of benzotriazole-hindered amine compound light stabilizer and its preparation, can solve the problem of reducing the durability of light stability protection performance, hydrolysis loss of compound light stabilizer, Carboxylate bridging groups have problems such as poor acid and alkali resistance stability, so as to improve the efficiency of light stabilization and light resistance, strong light stability protection ability, and the effect of inhibiting photooxidative degradation

Inactive Publication Date: 2014-04-16
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its carboxylate bridging group has poor acid and alkali resistance stability, and is easily affected by environmental problems such as acid rain in the protection of outdoor materials, which leads to the hydrolysis loss of the composite light stabilizer and reduces the durability of light stable protective performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1, a kind of preparation method of benzotriazole-hindered amine composite light stabilizer, carries out following steps successively:

[0038] 1), diazotization reaction of p-chloro-o-nitroaniline:

[0039] Add 0.3 mol of p-chloro-o-nitroaniline to a mixture of 1.2 mol of concentrated hydrochloric acid (hydrochloric acid with mass concentration ≥ 35%) and 20 ml of water, stir for 1 hour, and add 6.6 mol / L of sub Add 50ml of sodium nitrate aqueous solution for 1 hour, and keep it warm for 2 hours. After reaching the end of the reaction (that is, after the end of the reaction time), add urea to remove excess nitrous acid. The end point is detected by starch potassium iodide test paper. When it turns blue rapidly, it indicates that the reaction product does not contain nitrous acid. Filter to obtain a clear solution; the clear solution is a solution containing p-chloro-o-nitroaniline diazonium salt.

[0040] 2) Coupling reaction of p-chloro-o-nitroaniline diaz...

Embodiment 2

[0054] Embodiment 2, a kind of preparation method of benzotriazole-hindered amine composite type photostabilization, carry out the following steps in sequence:

[0055] 1), the diazotization reaction of o-nitroaniline

[0056] Add 0.3mol of o-nitroaniline to a mixture of 1.2mol of concentrated hydrochloric acid (hydrochloric acid with mass concentration ≥ 35%) and 20ml of water, stir for 0.5h, and add 6.6mol / L of nitrous acid dropwise at 0~5°C Add 50ml of sodium aqueous solution for 1 hour, and keep it warm for 2.5 hours. After reaching the end of the reaction (that is, after the end of the reaction time), add urea to remove excess nitrous acid; the end point is detected by starch potassium iodide test paper; When it turns blue, it indicates that the reaction product does not contain nitrous acid. Filter to obtain a clear solution; the clear solution is the final solution containing o-nitroaniline diazonium salt.

[0057] 2) Coupling reaction of diazonium salt of o-nitroanil...

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PUM

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Abstract

The invention discloses a benzotriazole-hindered amine composite photostabilizer of which the structural formula is disclosed in the specification, wherein R1 is H, CH3, C2H5, OCH3, OC2H5, Cl or Br, R2 is disclosed in the specification, R3 is alkyl group, alkoxy group or alkanoyl group, and R4 is H, alkyl group, alkoxy group or alkanoyl group. The invention also discloses a preparation method of the benzotriazole-hindered amine composite photostabilizer, which comprises diazo-coupling reaction, reduction ring-closing reaction, acyl-chlorination reaction, and alcoholization or ammonification reaction, thereby obtaining the benzotriazole-hindered amine composite photostabilizer.

Description

technical field [0001] The invention relates to a benzotriazole-hindered amine composite light stabilizer and a preparation method thereof. Background technique [0002] In recent years, due to the extensive use of chlorofluorocarbons, the atmospheric ozone layer has been severely damaged, and the amount of ultraviolet radiation on the surface has increased significantly. Ultraviolet rays can cause various lesions to the skin of the human body and seriously affect human health. At the same time, ultraviolet rays can cause photooxidative degradation of textiles and damage material properties; they can also cause photofading of dyes (pigments) and change the color of textiles. Therefore, improving the UV resistance of textile materials and protecting the textile itself and the human body has become a research hotspot in the field of textile dyeing and finishing in recent years. [0003] For textiles, the use of light stabilizers for anti-ultraviolet finishing is one of the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D401/12
Inventor 崔志华王超郑旭程羽君陈维国
Owner ZHEJIANG SCI-TECH UNIV
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