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Benzotriazole ultraviolet absorbent and preparation and application thereof

A technology of benzotriazoles and ultraviolet rays, which is applied in the direction of textiles, papermaking, dyeing, etc., can solve the problems of large molecular weight and low dyeing rate, and achieves simple preparation methods, strong protective effects, good application prospects and economical benefit effect

Inactive Publication Date: 2012-01-04
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the wide application of polyester textiles and the improvement of people's requirements for UV protection, UV absorbers for polyester have begun to attract people's attention, but most of the current commercial UV absorbers are developed for plastics. Large, low dyeing rate and other reasons are greatly restricted

Method used

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  • Benzotriazole ultraviolet absorbent and preparation and application thereof
  • Benzotriazole ultraviolet absorbent and preparation and application thereof
  • Benzotriazole ultraviolet absorbent and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] P-Hydroxyphenylacetic acid (5.0g, 32.9mmol) and thionyl chloride (11.2g, 94.1mmol) were added into a round-bottomed flask equipped with a condenser tube and a drying tube, heated to reflux for 3 hours, and then removed by distillation under reduced pressure Excess thionyl chloride was obtained to obtain p-hydroxyphenylacetyl chloride, which was cooled and directly used for the next reaction. Weigh 2-(2-hydroxyphenyl)-5-amino-2H-benzotriazole (7.0g, 30.9mmol) into a three-necked flask equipped with a drying tube, and re-distilled anhydrous tetrahydrofuran (70mL ) was dissolved, under the protection of nitrogen, the p-hydroxyphenylacetyl chloride prepared above was added into a three-necked flask with a syringe, and pyridine (2mL) was added, stirred and reacted at room temperature for 6 hours, the solvent was evaporated under reduced pressure, and then 95% ethanol was added (50mL), add water (50mL) to cause precipitation. The precipitate was filtered out and dried to obt...

Embodiment 2

[0032] Because the synthesized benzotriazole UV absorber is difficult to dissolve in water, N, N-dimethylformamide (DMF) is used as solvent to dissolve it, and the DMF solution of UV absorber is prepared, and the concentration is 20mg / L. Then, the absorbance of the DMF solution of the ultraviolet absorber in the entire ultraviolet wave band is measured by an ultraviolet-visible spectrometer to obtain an ultraviolet absorption curve. It can be seen from the figure that the ultraviolet absorber has strong ultraviolet absorption in the UV-A (320-400nm) and UV-B (280-320nm) bands, and also has certain absorption in the UV-C band with a wavelength less than 280nm. Intensity, its maximum absorption wavelength is 351nm. The protective performance of ultraviolet absorbers on polyester is related to the concentration of ultraviolet absorbers. By measuring the absorbance values ​​of different mass concentrations of ultraviolet absorbers at their maximum absorption wavelength of 351nm,...

Embodiment 3

[0034]After the UV absorber is dispersed, use the high temperature and high pressure exhaust dyeing method to carry out anti-ultraviolet finishing on the polyester fabric. The dosage of the UV absorber is 0.1-1.0% (o.w.f), and the exhaust dyeing process is: 60°C, pH 4-5, 1:20 bath For dyeing under specific conditions, the temperature was raised to 130°C at a heating rate of 2°C / min, and kept for 40 minutes. At a mass concentration of 10 mg / L, the UV transmittance of the polyester fabric before and after finishing with the UV absorber was measured, and it was found that the UV transmittance of the fabric after the UV absorber was dyed polyester was significantly reduced, indicating that the UV absorber has a strong ultraviolet light. Absorbent properties. In order to study the UV absorption performance of UV absorbers on polyester, the UPF value of polyester fabrics treated with different concentrations of UV absorbers was measured, and it was found that when the concentration ...

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Abstract

The invention relates to a benzotriazole ultraviolet absorbent and preparation and application thereof. The benzotriazole ultraviolet absorbent has the following structure. The preparation method comprises the following steps of: (1) preparing p-hydroxy benzene acetyl chloride; and (2) weighing 2-(2-hydroxyphenyl)-5-amino-2H-benzotriazole, dissolving the 2-(2-hydroxyphenyl)-5-amino-2H-benzotriazole into tetrahydrofuran, adding the p-hydroxy benzene acetyl chloride and pyridine under the protection of nitrogen, performing stirring reaction for 4 to 8 hours at normal temperature, adding ethanol and water after the reaction is finished to separate out sediment, filtering and drying the sediment, and thus obtaining the benzotriazole ultraviolet absorbent, wherein the ultraviolet absorbent is used as a printing and dyeing auxiliary agent of a terylene fabric. The benzotriazole ultraviolet absorbent has stable property; and the preparation method is simple, convenient, low in cost and environment-friendly, can improve the ultraviolet absorption performance of the terylene fabric, and has good application prospect and economic benefit.

Description

technical field [0001] The invention belongs to the field of textile printing and dyeing auxiliaries and their preparation and application, in particular to a benzotriazole ultraviolet absorber and its preparation and application. Background technique [0002] When plastics and synthetic fibers are exposed to sunlight or artificial ultraviolet light sources, they will accelerate discoloration, become brittle, and the coating layer will crack and fall off. Degradation (Xue Yong, Zhou Yongqiang, Zhou Wen, Synthesis of 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-6-chloro-benzotriazole, Fine Chemical Industry, 1998, 15 , 36). Therefore, light stability is a very important property of plastics and synthetic fibers. Benzotriazole ultraviolet absorbers have good absorption of ultraviolet rays in the range of 280-400nm, and have high melting point, low toxicity, certain water dispersibility at high temperature, and good compatibility with polymers. Better than benzophenones, it ...

Claims

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Application Information

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IPC IPC(8): D06P1/642C07D249/20D06P3/52
Inventor 李洪启杨燕燕钱海川陈浩张学斌张股林
Owner DONGHUA UNIV
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